origin - posterior sacruminsertion - angles of lower ribs, cervical transverse processesinnervation - dorsal ramiblood supply - (three portions)action - extends and bends vertebral column and head

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1.
origin - posterior sacrum

insertion - angles of lower ribs, cervical transverse processes

innervation - dorsal rami

blood supply - (three portions)

action - extends and bends vertebral column and head